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吴铭先 《中国海洋大学学报(自然科学版)》1987,(1)
本文建立了无限水平柱体的总磁异常之解释方法。同传统的异常解释方法(特征点法和积分法)相比较,本方法具有以下几个特点。首先,所提出的特征点法和积分法适合于任意磁化水平柱体的总磁异常的解释,这一点对于海上磁法勘探的资料解释具有一定的意义。因为海上磁测通量是测得总磁异常。其次,所提出的特征点法可以用来确定与柱体中心位置相对应的在剖面上的带影点。也说是坐标原点。再者,所提出的特征点法和积分法可用来计算水平柱体中心的深度,而在积分反演中只用到磁异常曲线的一部分。这一点同其他积分法相比,其计算过程比较简单。最后,也作了理论模型的正反演计算。反演结果表明,所提出的方法构能给出满意的反演结果。 相似文献
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吴铭先 《山东海洋学院学报》1987,17(1):136-141
本文建立了无限水平柱体的总磁异常之解释方法。同传统的异常解释方法(特征点法和积分法)相比较，本方法具有以下几个特点。首先，所提出的特征点法和积分法适合于任意磁化水平柱体的总磁异常的解释。这一点对于海上磁法勘探的资料解释具有一定的意义。因为海上磁测通量是测得总磁异常．其次．所提出的特征点法可以用来确定与柱体中心位置相对应的在剖面上的带影点，也就是坐标原点。再者，所提出的特征点法和积分法可用来计算水平柱体中心的深度，而在积分反演中只用到磁异常曲线的一部分。这一点同其他积分法相比，其计算过程比较简单。最后，也作了理论模型的正反演计算。反演结果表明。所提出的方法构能给出满意的反演结果。 相似文献
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A marine geomagnetic survey was conducted over Red Bay, a broad shallow sea area in the southern part of the Shandong Peninsula, to obtain geological information to meet the needs of an underwater engineering project. Analyses of magnetic data revealed the fault structure of the bedrock and differences in lithology. At the proposed offshore dam site, the magnetic survey results indicated the position of faults which have since been confirmed by other geophysical surveys. 相似文献
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海洋磁异常的解释已经对海洋地质学和海洋古地磁学的发展起了相当大的推动作用。已有多种方法可用于海洋磁异常的解释。在这些方法中将观测到的磁场同模型计算后所得到的磁场相对比是一种传统的异常解释方法。不过在此种方法中的模型计算多半都具有不同程度的假设前提,因而使其只具有一定的适应性。本文给出一种并无 相似文献
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吴铭先 《中国海洋湖沼学报》1988,(1)
Transform fault delineation is important for determining the direction of plate motion during sea floor spreading. The analysis of marine magnetic anomalies is one of the most powerful geophysical methods for this purpose. In this paper the characteristics of the magnetic anomalies over some transform fault zones in the North Pacific and in the North Atlantic are discussed. From comparison of the characteristics of these magnetic anomalies over transform fault zones with those of the NE-SW anomaly zone in the Davis Strait, the latter anomaly zone is interpreted not as the expression of a transform fault zone caused by horizontal movement during sea floor spreading but as an anomaly zone caused by basalt and therefore is inferred to be the expression of a fault zone produced by vertical crystal movement during volcanic activities. We discuss here the identification and correlation of linear anomalies in the Davis Strait region, and propose our hypothesis on the spreading history of the Davis Strait. 相似文献
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In 1981 a magnetic and bathymetric survey was carried out over Explorer Seamount located approximately between 48°50′ and 49°30′N and 130°40′ and 131°30′W. During the cruise four pillow fragments were dredged from peaks in this area. Based on the observed magnetic.data, it was identified that the main peak of Explorer Seamount should be of the Bruhnes age while the magnetic high in the N W of study area would be Gauss. This would yield a spreading rate of about 2 cm per year for the Matuyama epoch. The results of intensities of remanence measured from the pillow fragments indicate that the ages are less than 106 years. Similarly the Curie temperature is consistent with ages of around 106 years. An attempt was made to model the observed magnetic field using a series of uniformly magnetized NE-SW trending blocks of alternating polarity. Agreement between the model and observed results is satisfied. Oxidation ratios calculated from measured samples suggest that the main peak of Explorer Seamount is 相似文献
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